I received a lot of interesting messages from very interested people but as Unity is now exporting Flash Stage3D content, I had to stop development on my own 3D software, WorldBuilder.
I can just recommend to all to turn to Unity to build real-time 3D stuff.

I’ve almost finished the WorldBuilder migration under AIR 3.0.0.388.
For now, when you save your WorldBuilder project, the application export the project under an AS3 Project structure, which you can open with Flash Builder or FlashDevelop.

With the latest Away3D Broomstick framework, the possibilities are now huge and impressive in Flash 11 (still in incubator version). CornFlex WorldBuilder offers a UI approach to handle all the features of Away3D in a simple way to use for the end user.